Tack-driving device



June 23, 1925.

o. L. LAWSON TACK DRIVING DEVICE Filed Sept. 14, 1923 2 Sheets-Sheet 1 for curving the Patented June 23, 1925.

UNITED osoAI'ft'L. Lawson. or man, ivrAssAoIiUsETT's.

TACKLDRIVING DEVICE.

Application filed'rs ept'eniber 14', 19523. Serial No. 6623771.

ing ta'cks intothe soles of boots and shoes, I and has for its object the production of a device of this character in which means is provided-foebending the point of the tack during the driving operation so that said point will never extend through the inaterial; e r

The invention consists of a reciprocating memberadapted to drive a tack, and means operable by :the' movement of said member point of said' tack While being driven. ,1 I

The invention furtherconsists in certain novel features of construction and arrange ment of parts which will be understood readily by reference to the description of the drawings, and to the claims to be hereinafter given. i For the purpose of illustrating the invention, one preferred form thereof is shown in the drawings, this form having been found to give satisfactory and reliable results, although it is to be understood that the various instrumentalities of Whichthe invention consists can be variously arranged and organized, and that the invention is not limitedto the precisearrangement and or ganization of the instrumentalities ashere in shown and described, except as required by the scope of the appended claims.

Ofthe drawings: Figure 1 represents a front elevation of a device embodying the principles of the present invention.-

Figure 2 represent-s same.-

Figure 3 represents aninverted plan of thesame. a Figure 4 represents a vertical section of same on line 4, t on Fig. 1. j

Figure 5 represents a vertical section on line5 5 on Fig.- 4.- Y

Figure 6- represents a detail showing a side elevation of tack clamped between the tack hold'ingjaws and the pointturning member in open position'. I

Figure 7 represents a similar view with the point turning member in closed pbsitlon.

Figures 8 and 9 represent. plans ofthe ends of the tack clamping jaws.

Figure 10 represents an elevation of a tack with the point curved afterv being driven, and I Figure 11 represents a sectional detail of the lower end of the tack separator.

Similar characters indicate like parts throughout the several figures of the draw 1ngs;, 1

In the drawings, 10 is a casing havinga .tubula'rinernber ,or plunger 11 gtherein in which is disposed a, cylindrical driving member 12 having a driver 13 in the lower end thereof. l v

Thetu'bularmember or plunger 11 has a head 14; threaded to'its upper e'nd, the outer face of which is rounded so that it maybe struck by the. hand when it is desired. to drive a tack.

The casing l Ohasa pin 15 mounted thereinandextending through a slot 16 in the tubular member or plunger 11 and between this pin 15 and the head Mispositi'ohed spring 17 adapted to return-theplunger 11 to its normal position as indicated in the drawings, after it'has been; moved downwardly in the casing 10 to drive a tack. As

shown in the drawings, the plunger 11- is adapted to be manually operated, but it is obvious that, the casing may be mounted uponT-a machine and the plunger 11 actuated by power. v I 1 The upper. end of the cylindrical member 12 is secured in the bottom :of the tubular member or plunger 11 by means of a' pin 18; Looselymounted on the cylindrical, member 12 is a collar 19 having diametrically disposed ears 20 extending laterally there'- from, the-downward movement of said collar 19 on the cylindrical member 12 being limited by the pin 12 extending laterally from the member 12.- e

Mounted upon the lower end of the cass ing 10 is a laterally extending. bracket 21 tohthe outer end of which is securedthe inclined,.raceway 22 inwhich is disposed a plurality of tacks 23; to be driven into material such, for instance, as a boot or shoe.

' The lower end of the raceway has a Serrate P 't OI '24: adapted to rest upon the the 1 sole of Work and retain it in position while the tack is being driven. v

The upper end'of the raceway is provided with a device adapted to engage with a loading mechanism of any well known construction, while the raceway is being filled with tacks. This loading mechanism and the means 25 for attaching it to the raceway form no part of the present invention, and therefore require no illustration or descript-ion.

Between the collar 19 and the bottom of the tubular member 12 is a spring 26 which normally retains the collar 19 in contact with the pin 12*, but is adapted to be com pressed when the collar 19 reaches its lowest position and the cylindrical member 12 moves downwardly there-through.

The lateral pin 12 in the lower end of this cylindrical member 12 .is adapted to engage a cam face 27 on a tack separating lever 28 pivoted at 29 to the hub of the bracket 21 The lever 28 has a finger 30 adapted to enter between the tacks in the raceway 22 and separate one from the rest and force,

it; from the end of the raceway into the oppositely disposed grooves in the clamping jaws 31, 31*, pivoted at 32 to the ears 20 extending outwardly from the collar 19.

The entering end of the finger 3O iswedgeshaped as indicated at 32 in Fig. 11 of the drawings, and is normally within the race way until the pin 12*, acting upon the cam surface 27, forces it outwardly therefrom against the tension of the spring 22 secured to the raceway 22. 1

The jaws 31, 31 are held together normally by the spring 34, and have projections 34* thereon, adapted to bear normally upon the cylindrical member 12 to limit the inward movement of said jaws toward each other, and centralize the tack 23 beneath the'driver 13.

One jaw 31 has pivoted thereto at 35 a lever 36 having atone end a lateral pin 37 adapted to engaged a cam 38 on a downwardly extending bar 39 secured at 40 to the hub of the bracket 21. The pin 37 is retained in engagement with the cam 38 by means of the spring34 one end of which is secured to the lever 36, and thus saves the double purpose of holding the jaws 31, 31 together and also the constant contact between the pin 37 and cam 38. j r

The hub of the bracket 21 is preferably split and clamped to the casing 10 by the screw 41.

The lower end of the jaw 31 has less depth than the depth of the lower end of jaw 31, and the gripping face of the jaw 31 is curved away from the axis of the driver 13 as indicated at 42.

The lever 36 has a lateral finger 43 at its lower end which extends beneath the lower end of the jaw 31*, and when the jaws 31,

forcing the joint of the tack against the curved face 42, thus curving said point as it is driven into the material.

The face of the finger 43 coacting with the curved face 42 of the jaw 31 is curved to fit said curved face 42..

The jaws 31, 31 are curved slightly at 44 so that when the driver 13 is forced downwardly against the head of a tack held by said jaws, it will spread the jaws 31, 31 apart, permitting the end of the driver 13 to enter between said jaws and drive the tack into the material.

This operation does not occur, however, until the cylindrical member 12, collar 19 and jaws 31, 31 have moved downwardly together to a point where the lower end of the jaws 31, 31 reachthe upper face of the work.

Until this time, the arms 45 on the upper ends of the jaws 31, 31 bearing against the outer wall of the hub of the bracket 21 prevent the jaws 31, 31 from separating.

By the time the lower ends of the jaws 31,

31 reach the work, the arms 45 will pass from contact with said hub and may then move toward each 1 other, permitting the lower ends of the aws to be separated by the driver 13 as it drives a tack.

When the driver 13 moves upwardlyfrom between the jaws 31, 31*, the spring 34 will again move the lower ends of the jaws 31, 31* together and the arms 45 outwardly, so that the latter may again bear upon the hub of bracket 21. c

When the hub 13 moves upwardly, the tack separator 28operates to force another tack between the jaws 31, 31 preparatory to another downward movement of the driver 13.

Preferably the adjacent walls of tackgripping portions of the jaws 31, 31 nearest the tack separator 28, 30 are slightly separated to permit the free admissionof a tack between the gripping portions of said aws.

lVhen a tack is driven by a device such as is herein shown and described, the pointed end of the tack will be curved as indicated in Fig. 10, and as it enters the work, the point will continue to follow this curve so that it will be impossible for it to pass through the material.

It is obvious, therefore, that by the use of this device a shoe may be made in which the tacks used in its construction will never enter the interior of the shoe to annoy the wearer thereof.

It is believed that the operation and n'iany advantages of the invention will be fully apparent without further description. Y Having'thus described my invention, I claim: v j

1. In a device of the class described, a casing; a reciprocating member therein a driving'member; secured thereto; a collar through which said driving" memberqis adapted to move; jaws pivotally mounted on said collar; meansfor feeding-a tack betweensaid jawsameans permitting said jaws to separate when the driving member is actuated; and means operable during the driving operation for curving the pointed end of the tack being driven.

2. In a device of the class described, a casing; a reciprocating member-therein; a spring for forcing said member outwardly; a driving member secured to said reciprocating member and provided with a'limiting stop; a collar loosely mounted on said driving member; a spring for normally retaining said collar against said stop; a pair of jaws pivoted to said collar; a spring normally retaining the lower ends of said jaws in contact; means for feeding a tack between said jaws; and means permitting said jaws to separate when the driving member is actuated.

3. In a device of the class described, a casing; a reciprocating member therein; a spring for forcing said member outwardly; a driving member secured to said reciprocating member and provided with a limiting stop; a collar loosely mounted on said driving member; a spring for normally retaining said collar against said stop; a pair of jaws pivoted to said collar; a spring normally retaining the lower ends of said jaws in contact; means for feeding a. tack between said jaws; means limiting the inward movement of said jaws toward each other; and means permitting said jaws to separate when the driving member is actuated.

4. 1m a device of the class described, a casing; a reciprocating member therein; a spring for forcing said member outwardly; a driving member secured to said reciprocating member and provided with a limiting stop; a collar loosely mounted on said driving member; av spring for normally retaining said collar against said stop; a pair of jaws pivoted to said collar; a spring normally retaining the lower ends of said jaws in contact; means for feeding a tackto said jaws; projections on said jaws engaging said driving member for limiting the inward movement of said jaws toward each other; and means permitting said jaws to separate when the driving member is actuated.

5. In a device of the class described, a pair of pivoted jaws; means for feeding a tack between said jaws; a driving member adapted to engage said tack and drive it between said jaws intothe work; and means opertack between said jaws; a driving member adapted toengage said tack and drive it between saidjaws into the work; and a pivoted lever having a .finger coacting with one of said jaws andoperable during the driving operationifor curving the point of the tack as it enters the work.-

7. In adevice of the class described, a pair of pivoted jaws, one of which has a curved inner face atits lower tack-gripping end; means for feeding a tack between said jaws; a driving member adapted tobe moved downwardly between said jaws and drive the tack; and means on the other jaw coacting with said curved inner face for curving the point of said tack.

8. In a device of the class described, a pair of pivoted jaws, one of which has a curved inner face at its lower tack-gripping end; means for feeding a tack between said jaws; a driving member adapted .to be moved downwardly between said jaws and drive the tack; and pivoted means on the other jaw coacting with said curved inner face for curving the point of said tack.

9. In a device of the class described, a casing; a driving member therein; a collar loosely mounted thereon and adapted to move therewith a limited distance and then permit the driving member to move thereloosely mounted thereon and adapted to] move therewith a limited distance and then permit the driving member to move therethrough; a pair of jaws pivoted to said collar with their gripping faces in contact; means permitting said jaws to separate when in contact with the work to permit the passage of the driver there between to drive a tack; a lever pivoted to one of said jaws and provided with a finger coacting with the other for curving the point of the tack during the driving operation. 7

11. In a device of the class described, a casing; a driving member therein; a collar loosely mounted thereon and adapted to move therewith a limited distance and then permit the driving member to move therethrough; a pair of jaws pivoted to said collar with their gripping faces in contact:

means permitting said jaws to separate when in contact with the work to permit the passage of the driver there between to drive a tack; a lever pivoted to one of said jaws and provided with a finger'coacting with the other jaw for curving the point of the tack during the driving operation, said lever having a lateral pin; and a fixed cam member with which said pin coacts during the down ward movement of said jaws. I

, 12. In a device of the class described, a casing; a bracket extending laterally therefrom; a pair of jaws adapted to grip a tack; a driving member adapted to enter between said jaws and'drive thetack; a raceway for tacks supported from said bracket; a lever pivoted to said bracket and provided with a cam face and a wedgeshaped finger extending through said raceway; a spring for way, the lower end of said raceway having a serrated work-engaging face.

Signed by wine at 746 Old South Bldg, Boston, Mass, this 11th day of September,

OSCAR LLAWSON.

Witnesses:

WALTER E. LOMBARD, NATHAN C. LOMBARD, 

